The Oxford Thesaurus An A-Z Dictionary of Synonyms - incisiveadj.

1) keen, sharp, acute, piercing, perspicacious, perceptive, percipient, penetrating, trenchant, canny, shrewd: Shirley offered some incisive observations on the matter. 2) sarcastic, biting, mordant, cutting, caustic, sardonic, ironic(al) , sharp, acid, tart, acrid, acrimonious, bitter, acerbic, cynical, stinging, critical: Your incisive comments are not really appreciated, George.